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Y. Sakakibara; M. Sugiura; Y. Takada; H. Hayashi; T. Suzuki; Y. Hayashi; R. Masuda; M. Taguchi; K. Inaba; K. Kaida. (2005). Reduction of gum emitted from shell mold during casting aluminum alloy. , 168(2), 354–359. doi:10.1016/j.jmatprotec.2005.02.253 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research